If you purchase an independently reviewed product or service through a link on our website, Variety may receive an affiliate commission. The cast of the hit MTV reality series “ Laguna Beach ” is going back to the beginning with an all-new reunion special airing this week on The Roku Channel . Lauren Conrad, Stephen Colletti and Kristin Cavallari are among the original cast members returning for “The Reunion: Laguna Beach,” which premieres April 10. Viewers can watch the two-hour Roku Original